Question

read the article and use the information to answer the questions that follow.

discovering the structure of dna

explain how the discoveries by rosalind franklin helped watson and crick build an accurate model of dna.

Explanation:

Identify Franklin's key evidence

Photo 51 (X-ray diffraction image)

Determine structural insights provided

Double-helix shape, helical dimensions, and outward-facing phosphate backbone

Connect to Watson and Crick's model

Allowed them to correctly arrange the nucleotide chains and nitrogenous bases inside the helix

Answer:

Rosalind Franklin's X-ray diffraction image (Photo 51) provided critical visual evidence that DNA has a double-helix structure with a consistent width and outward-facing phosphate backbones. This data allowed Watson and Crick to correctly arrange the nucleotide chains and nitrogenous bases to build their accurate three-dimensional model.